Office



(No Model.) 5 Sheets-Sheet 1.-

0. E. ROBERTS.

MACHINE FOR THRBADING BUNG BUSHES. No. 277,160. Patented May 8,1883.

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(No Model.) 5 Sheets-Sheet 2.

0. E. ROBERTS. vMACHINE FOR THREADING BUNG BUSHES. I No. 277.160. Patented May 8,1883.

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WM I "WNW 5 Sheets-Sheet 3.

(No Model.)

0. E. ROBERTS.

MACHINE FOR THREADING BUNG BUSHES.

Patented May 8, 1883.

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(No Model.) 5 Sheets-Sheet 4. G. E. ROBERTS.

MACHINE FOR THREADING BUNG BUSHES.

Patnted May 8 5 Sheets-Sheet 5 (No Model.)

C. E. ROBERTS.

MACHINE FOR THREADING BUNG BUSHES. I No. 277,160. Patented May 8,1883.

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UNITED STATES ATENT- OFFICE.

CHARLES E. ROBERTS, OF CHICAGO, TLLINOIS, ASSIGNOR TO THE CRANE BROTHERS MANUFACTURING COMPANY, OF SAME PLACE.

MACHINE FOR THR EADING BUNG -BUSHES.

SPECIFICATION formingpart of Letters Patent No. 277,160, dated m 8, 1883.

Application filed October 3, 1881. (No model.)

To all whom tt may concern: I

Be it known that I, CHARLES E. ROBERTS, residing; at Ghica go, in the county of Cook and State of Illinois, and a citizen of the United is a detail.

States, have invented a new and useful Im provement in Machines for Threading Bung- Bushes, of which the following is a full description, reference being had to the accompanying drawings, in which- Figure 1 is a top view. Fig. 2 is a side elevation. Fig. 3 is an end elevation. Fig. 3 Fig. 4 is a detail, being a section at or near line as of Fig. 3, looking down. Fig. 5 is a section taken at line g of Fig. 1, lookingto the right. Fig. 6 is a detail, a part of the same being in section at line a of Fig. 1. Fig. 7 is a detail, beinga section at line at of Fig. 3. Fig.8 is a detail, being a horizontal section at line 3 of Fig. 3. Figs. 9 and 10 are enlarged details.

The object of my invention is to construct improved devices to be used in cutting screw-- threads on metals. The machine which I have shown in the drawings is especially designed to be used in cutting screw-threads upon the exterior of bung-bushes; but the machine is,

. or with slight mechanical changes may be,

' which carries a driving-pulley, O, and a small gear-wheel, D.

E is a shaft supported in suitable bearings, one end of which is adapted to receive the bushes upon which screw-threads are to be cut, B being one of such-bushes upon such endof the shaft E.

F is a leading-screw keyed to the shaft or spindle E.

G is ahand-wh'eel upon that end of the spindle or shaft E opposite to the end which carries the bush. This spindle or shaftE is hollow, and in it is a device for expanding the end which sleeve the shaft M moves. end of this lever engages with the cam (Z, the.

| of the spindle which carries the bush. The

devices for accomplishing this are well known, and I have not shown them in the drawings.

H is a cog-wheel which engages with the cog-wheel D. This wheel H is loose upon the shaft E. a

I is a clutch on the shaft E. The clutch can be engaged with the wheel H. K is a fork which engages with the clutch I, and is operated by a lever, J. This fork is connected to a hub, L, secured to the shaft M, which has a longitudinal movementinits bearings, in the standards A A, When the clutch is engaged with the wheel H the end of this shaft M which is in the standard A will be on a line with the outside of such standard A, and it will he held there by the weighted lever N, one arm, a, of such lever being then partially over the end of the shaft M, as shown in Fig. 3. This weighted lever is pivoted to the machine at b, and has a second arm, 0, extending downward.

0 is a strong spring, one end of which is attached to the lower end of the fork K and the other end to the standard A. r

d is an eccentric or cam upon the shaft E.

e is a lever pivoted upon a sleeve which is secured to the frame or standard ,A, through The upper lower end being free.

Q is a chasing-bar, which has a limited lonin g its threads engaging with and corresponding with the threads upon the leading-screw F. This follower is located in a chamber in a head, 9, upon the end of the arm R. The followerf has a rod or pin, it, secured to it, which pin it passes up through the chamber g and through its top,as shown in Fig. 6. Within this chamber g, and encircling the pin it, is a coil-spring, 7:, arranged to yield as the follower f moves vertically in its chamber g. On the opposite end of the chasing rod or bar Q, is secured a head, j, which carries a cutter, 7a .(Jonneoted with thishead and extending downward therefrom is an arm or lever, S, the headj and arm or lever S being connected together, and both being secured firmly tothe end of the chasingbar Q.

T is a sliding piece moving in suitable guideways in or upon the standard A.

U is an eccentric and many sided wheel, which is pivoted on the outside and at one end of the slide T. In this wheel are a number of pins, l, projecting a little way from the inside of the wheel U, the pins corresponding in number with the number of sides or faces on the wheel U. One of the pins, m, is longer than the others, and its end is beveled. (See Fig. 3

In the slide T is a loose pin, it, having one end beveled, and arranged so that the end of the pin at will at a certain time come in contact with it. This pin it is held in the position shown in Fig. 3 except when forced inward by the action of the pin m. It is thus held in and returned to place by the small spring 0, which is located in a recess in the slide T. This pin is so located and arranged that when it is forced inward by the pin m the projecting end on the inside of the slide T will then be in position to engage with the lower end of the arm c of the lever N.

V is a hearing or socket cast upon the slide T, in which socket V is a small sliding piece, 19, which is so arranged that one end comes in contact with theface of the eccentric wheel U.

Upon the otherend of the slidep is a piece or block, q, having one side inclined, as shown in Fig. 4.

W is an arm or projecting piece upon the inside of the slide T, which arm W extends through a slot or opening in the standard A, and the inner end. of this arm W, or a piece, 1", thereon, can come in contact with theinside of the lower end of the lever e, or with a pin or screw therein.

sis a hollow arm extending out from the standard or frame A.

tis a sliding catch moving in the hollow arm 8. The inner end of this catch 15 is arranged to engage with a notch in the slide T,

which notch is so located that when the slide is drawn out it will be held by the sliding catch t. (See Figs. 4 and 7.)

a is a screw in the upturned end of the sliding' catch it.

o is a small piece fastened to the lower end of the lever S, which piece is arranged'so that it can come in contact with the inner end of the screw it.

t0 is-a screw which passes through the lower end of the lever S. This screw has a ball upon its inner end. p

a is a small block having a socket which receives the ball upon the end of the screw to. This block is arranged to come in contact with the partq. e

b is a screw in a projection, 0, upon one end of the slide T, which screw is for the purpose of regulating the distance which the slide T moves when released from the catch 25.

B is a strong coiled spring, one end of which is secured to the main frame, and the other end is secured to the head j, which carries the cutter.

C, Fig. 5, is a strong coiled spring, one end of which is secured to theinside of the standard or end A of the frame, and the other end is connected with a pin, (1, extending out from the projection 0 upon the slide T.

D is another coiled spring, one end of which is connected to a fixed pin, e, and the other end to a pin,f, projectingdown front the sliding catch t.

E is another coiled spring, one end of which is-secured to the lever S, nearits lower end,

and the other end is secured to the stud which carries the wheel U.

y is a pawl or catch pivoted to the main frame, and arranged to catch over the pins in the wheel U. (See Fig. 3.)

The leading-screw F may be made tapering,

corresponding with the taper of the bushes or other article upon which the threads are to be cut; but this is not essential.

standard A, and, notwithstanding the action of the spring 0, this arm a of the lever will hold the shaft M in the position shown in Figs. 2 and 3. .Motion will'be given to the spindle E and bush R by the tnoving shaft B, and during the first revolution of the spindle E the cam (7, upon such spindle, will comein contact with the upper end of the lever e, throwing the upper end out, and causing the lower end of this lever e to push the slide '1 out, as shown in Fig. 3. By this movement of the slide T the lower end of the lever S will be thrown a little to the right by the action of the piece q upon the block a, and the cutter it, having too ' down so as to comein contact with the bush,

and the follower fwill also be thrown'down V and engage with the leading-screw F, the head J, which carries the cutter, and the followerf being both connected with the same rocking shaft, Q. At this time, when the cutting is to commence, the eccentric wheel U will be in the position shown in Fig. 3. As the leadingscrew F revolves with the spindle E, the follower f, being engaged with such leading-screw, will travel gradually toward the right, causing the shaft Q to-slide in its bearings, carrying with it the headj and cutter k, and as the cutter travels over the face of the bush the lever S, being also secured to the chasing-bar Q, must move in the same direction, and the block a. will travel on the inclined face of the piece 9, which incline corresponds with the inchne of the bush, and hence the cutter will be gradually lowered as it passes from one end of the bush to the other, and will cut' all the way. During this operation the slide T will be held out in the position shown in Fig. 3by the sliding catch t, which will then be engaged with anotchin the slide T. IVhen the cutterreaches the end of the bush the end of the lever S, or the piece c thereon, will come in contact with the inner end of the screw it, and will force the sliding catch it outward, disengaging it from the notch in the slide T. Then,by the action of the spring 0, the slide T, with the wheel U, pivoted thereto, will be carried to the left, looking at Fig. 3. At the same time the wheel U will be made to perform a partof a revolution, because the-pawl y will then be engaged with one of the pins Z. At the same time, by the action of the spring E, the lower end of thelever Swill be carried to the left. lookingat Fig. 3, which will raise the cutter it away from the bush and the follower f away from the leading-screw F,

and then the action of the springB willmove the cutter and the follower to the left, looking at Fig. 1, into proper position to commence the second cutting. Then the cam d, coming again in contact with the lever 0, will cause it to move the slide T out again, at the same time throwing the lower end of the. lever S to the right, as before, and bringing the cutter 7c and the followerfdown. The cutter willnow cut a little deeper than before,because the eccentric wheel U has been, as before stated, partially rotated, and another face of this wheel has been brought in contact with the end of the slide 1;, throwing the lower end of' the lever S a little farther to the right than before, and consequently causing the cutter k to cut a little deeper. When thecutteragain reaches the end of the bush the operation before described will be again repeated-that is to say, the sliding catch it will be released from the notch in the slide T, the spring 0 will again act upon the slide, carrying it inward with the wheel U, giving this wheel another partial rotation, and bringing another pin Z into engagement with the pawl. The cutter and follower will also be lifted, as described, and be returned to the left, ready to repeat the operation.

The vertically-moving follower f and the spring z' are important, because the cutterk is brought with each successive cutting a little lower than before, and the head 9 is correspondingly lowered, which could not be the case if the follower f were rigidly secured thereto; but by making this follower vertically movable in the chamber in the head g, and providing the spring *5, the follower becomes self-adjusting, rising a triflein its chamber as the cutter is lowered.

As shown, the wheel U has eighteen pins and eighteen faces upon its periphery, which faces are eccentrically located, and with this construction there; will be eighteen separate cuttings of the screw-thread before it is completed. Upon the full completion to the cut- .arm 0 upon the weighted. lever N, and will move such lower end 'of the arm a a little to the left, which will cause the upper end of the arm a to move to the right, (looking now at Fig. 3,) carrying it away from the opening in A, in which one end of the shaft M is located. At the same time, by the action of the spring 0, the shaft M will be moved to the right, (looking now at Fig. 2,) disengaging t-heclutch from the wheel H, and the spindle E will then cease to rotate. The operator can then remove the completed bush and put another in place upon the end of the spindle E. Then by means of the leverJ the clutch can be made to engage with the wheel H, as'before, and the described operation will be repeated.

I do not limit myself to the use of the wheel U, having eighteen pins and faces. A greater or less number can be used, as required. 7

What I claim as new, and desire to secure by Letters Patent, is as follows:

1. The combination, with a chasing-shaft, Q, havinglongitudinal and rocking movements in its bearings, and a cutter, it, carried by one end of said shaft, of an arm, It, carried by the other end of the shaft, a follower, f, having a rod'or pin, it, passing through the said arm, and a spring acting upon the inner end of the follower for permitting the latter to yield vertically to automatically adjust itself, substan tially as described.

2. In a machine for cutting screw-threads,

a chasing-bar, Q, carryin g a cutter-head, j, and

an arm or lever, S, upon one end and a follower,f, upon the other end, in combination with the spindle E, leading-screw F, cam d, lever e, slide T, and a device for holding the slide out, substantially as and for the purposes specified.

3. In a machine for cutting screw-threads, a chasing-bar, Q, carrying a cntter-head,j, and an-arm or lever, S, upon one end and a follower, f, upon the other end, in combination with the spindle E, leading-screw F, cam 02, lever c, slide T, wheel U, and a device for bold ing the slide out, substantially as and for the purposes specified.

4. In a machine for cutting screw-threads, the combination of a chasing-bar, Q, carrying a cutter, k, and lever S upon one end and a follower upon the other end, spindleE,leadingscrew F, cam (I, shaft M, leverse and N, slides T and catch it, wheel U, provided with pins I, and faces eccentrically arranged, and springs B, C, D, and E, substantially as and for the purposes specified.

Witnesses:

CHARLES E. ROBERTS.

ALBERT H. ADAMS,- BERTHA A. PRICE. 

